News – October 2010

October 18, 2010 cora.rimoldi Comments off

Great Kiskadee *Pitangus sulphuratus*© Carlos Gonzalez Ledo	Neotropic Cormorant *Phalacrocorax brasilianus*© Carlos Gonzalez Ledo
Spot-flanked Gallinule *Gallinula melanops*Adulto con dos crías muy pequeñas. © Claudia y Tito Di Mauro	Spot-flanked Gallinule *Gallinula melanops*Juvenil © Claudia y Tito Di Mauro
Striated Heron *Butorides striatus*© Carlos Gonzalez Ledo	Rufescent Tiger-Heron *Tigrisoma lineatum*© Carlos Gonzalez Ledo
Masked Duck *Nomonyx dominica*Female © Claudia Furman	Tropical Kingbird *Tyrannus melancholicus*First Kingbird photographed in the reserve © Claudia Furman
Vermilion Flycatcher *Pyrocephalus rubinus*Male © Carlos Gonzalez Ledo	Solitary Cacique *Procacicus solitarius*The same technique with an unusual meal. It inserts the bill and opens it to tear the piece of bread apart. © Roberto Ares
Scarlet-headed Blackbird *Amblyramphus holosericeus*© Claudia y Tito Di Mauro	White-faced Whistling-Duck *Dendrocygna viduata*Two structural characteristics of sievers can be identified in the bill of this White-faced Whistling-Duck. A flared maxilla at the tip and a highly developed nail. Sievers feed separating food particles from the water. The lamellae, thin plates which line the edges of the bill, function like a strainer. They let water out and retain material food. © José Luis Merlo
Spot-flanked Gallinule *Gallinula melanops*Courtship display: The female stimulates the male showing receptiveness. With the back arched, the rigid wings a bit raised as if touching the tips at the back and the head lowered. The male perceives the female´s disposition and follows her. They engage in a merry-go-round movement and after three turns the female stops to be mounted. © Roberto Ares	Spot-flanked Gallinule *Gallinula melanops*The female does not dip the head into the water. As the action is finished the female goes away with a wing shuffling. The male makes a bow display arching his body and lowering the head. © Roberto Ares
Fulvous Whistling-Duck *Dendrocygna bicolor*Unluckily the scene was captured once it had begun and it was not possible to document the existence of courtship displays prior to mating. During mating the female remains under water and the male holds her by the head. After copulation both celebrate with a short but vigorous water treading as they rise parallel sticking their chests out and keeping their half-folded wings raised. © Roberto Ares	Rufescent Tiger-Heron *Tigrisoma lineatum*Three chicks in three different sizes. This is because Tiger-Herons, unlike most bird species, begin to incubate immediately after the egg is laid. Since the eggs take the same number of days to develop they hatch staggeredly. This is known as asynchronous hatching and accounts for the difference in size. The oldest chick is almost a month old. © Claudia y Tito Di Mauro
Red-crested Cardinal *Paroaria coronata*In nest © Claudia y Tito Di Mauro	Red-gartered Coot *Fulica armillata*Feeding the chicks © José Luis Merlo
Gray-breasted Martin *Progne chalybea*Gray-breasted Martins have arrived … © Roberto Ares	Gray-breasted Martin *Progne chalybea*…and packed the antenna, the meeting place. © Roberto Ares
Southern Lapwing *Vanellus chilensis*We did not spot the nest but here is the proof. One of the two chicks, very well camouflaged, under the adult’s supervision. © Roberto Ares	Rufescent Tiger-Heron *Tigrisoma lineatum*Following the development of the heron chicks. They are three weeks old. © Carlos Gonzalez Ledo
Lake Duck *Nomonyx dominica*Male © Roberto Ares	Glittering-bellied Emerald *Chlorostilbon aureoventris*Male © Carlos Gonzalez Ledo